Phenomenon of animal trapped inside a stone

Described by the experts, namely the story of small animals such as frogs and lizards were found wrapped / hard rock stuck in life. This phenomenon is actually happening and has been widely reported since the 18th century. Various questions arise from the phenomenon that is felt no sense of this. But that is not exhausted to think, how how these animals into stone? and how they survive in the narrow space between the hard rock that is very difficult to penetrate the air? What do they eat there? Of course my friend knew the types of igneous rocks (igneous rocks) such as granite, obisidian, etc.? Well, in the general case of "imprisoned" frogs and lizards are often found in rocks of that type.
 
In 1821, the magazine Tilloch Philosopical lifting an article about a stonemason named David Virtue who made a surprising discovery. He found a lizard that lives in the hard rock that was just completed. Lizard as he put it in there until the inside of the stone etched to form the pattern of his body. Interestingly, after a suspect died after a few moments after being sent lizard showing signs of life and a moments later he could run.
Then in 1899, frog is also found in the stone quarry by fire some employees in the UK. During World War II, several British soldiers who frequently use explosives to create such a trench is also often found that some frogs and lizards that are in some rocks which broke away from the explosion. But not only in igneous rocks, in fact this phenomenon can be found, in 1910, frog is also found in a piece of coal, several other cases have also found a limestone. Somehow a way to explain this phenomenon. Maybe there are friends who want to theorize ??